Table 2. Ancient macrofossil remains investigated in the study.
| Sample # | Species | Order | Family | Locality | Sediment | Age (14C yr. BP) | Collection year | p.p. | Level |
| CFx3.1 | Lepidophorus lineaticollis Kirby, 1837 | Coleoptera | Curculionidae | Alaska | Al-4-05-B24/QIII | 47,600±1900 (UCIAMS 56391) | 2005 | ||
| CFx3.2 | Diptera indet ?! | Diptera | ? | Alaska | Al-3-05-B9/QIV | 9,752±85 (AA52066) | 2005 | ||
| CFx3.3 | Lepyrus sp. (a leg) | Coleoptera | Curculionidae | Alaska | Al-3-05-B9/QIV | 9,752±85 (AA52066) | 2005 | ||
| CFx3.4 | Lepidophorus thulius (Kissinger, 1974) | Coleoptera | Curculionidae | Alaska | Al-2-05-B7/QIII | 10,595±25 (UCIAMS 36670) | 2005 | 100% | Order |
| CFx3.5 | Lepidophorus lineaticollis Kirby, 1837 | Coleoptera | Curculionidae | Alaska | Al-2-05-B7/QIII | 10,595±25 (UCIAMS 36670) | 2005 | ||
| CFx3.6 | Camponotus herculeanus (Linnaeus, 1758) | Hymenoptera | Formicidae | Alaska | Al-3-05-B13/QIV | 7,110±110 (GSC 6675) | 2005 | ||
| CFx3.7 | Morychus sp. nov? | Coleoptera | Byrrhidae | Alaska | Al-4-05-B24/QIII | 47,600±1900 (UCIAMS 56391) | 2005 | ||
| CFx3.8 | Amara alpina (Paykull, 1790) | Coleoptera | Carabidae | Chukotka | ChM-B15 | Ca. 26,000 | 2004 | 95% | Family |
| CFx3.9 | Lepyrus nordenskioeldi Faust, 1885 | Coleoptera | Curculionidae | Chukotka | ChM-B15 | Ca. 26,000 | 2004 | ||
| CFx3.10 | Morychus viridis Kuzmina & Korotyaev, 1987 | Coleoptera | Byrrhidae | Chukotka | ChM-B15 | Ca. 26,000 | 2004 | ||
| 63% | Species | ||||||||
| CFx3.11 | Tachinus brevipennis Kiesenwetter, 1850 | Coleoptera | Staphylinidae | Chukotka | ChM-B15 | Ca. 26,000 | 2004 | 73% | Family |
| CFx3.12 | Aphodius sp nov? | Coleoptera | Scarabaeidae | Chukotka | ChM-B34 | Ca. 20,900 | 2004 | ||
| CFx3.13 | Sitona borealis Korotyaev, 1979 | Coleoptera | Curculionidae | Chukotka | ChM-B33 | Ca. 20,100 | 2004 | ||
| CFx3.14 | Notiophilus aquaticus (Linnaeus, 1758) | Coleoptera | Carabidae | Chukotka | ChM-B15 | Ca. 26,000 | 2004 |
Authentic DNA sequence obtained from: CFx3.4, CFx3.8 and CFx3.11.
14C yr. BP) radiocarbon years before present (1950); p.p.) posterior probability of assigning the sequence to the given taxonomic level. The species Amara alpina is also known as Curtonotus alpinus (Paykull, 1790) in some literature. Lepidophorus thulius was until recently known as Vitavitus thulius Kissinger, 1974.
Alaska sample ages estimated from radiocarbon dates of associated plant macrofossil ages from sampling horizon. Chukotka sample ages estimated from sedimentation rate based on overlying and underlying radiocarbon dated samples of plant macrofossils (See Materials and Methods section).